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2 years ago

Which of the following indicates that an exothermic reaction has taken place?

Chemistry

2 answers:

Tomtit [17]2 years ago

4 0

<h2>Answer:</h2>

The option B is correct option. Which is release of heat and/or light energy .

<h3>Explanation:</h3>

According to the definition of exothermic reaction :

<em>An exothermic reaction is a chemical reaction that releases energy by light or heat.</em>

From definition option B (release of heat and/or light energy) indicates that an exothermic reaction has taken place.

mote1985 [20]2 years ago

4 0

Answer: Option (B) is the correct answer.

Explanation:

An exothermic reaction is defined as the chemical reaction in which there occurs release of heat.

For example, $A + B \rightarrow AB + Heat$

In an exothermic reaction, energy of reactants is more than the energy of products.

Whereas an endothermic reaction is defined as a chemical reaction in which heat is absorbed by reactant molecules.

For example, $A + B + Heat \rightarrow AB$

In endothermic reaction, energy of reactant molecules is less than the energy of products.

Thus, we can conclude that release of heat and/or light energy indicates that an exothermic reaction has taken place.

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Name any three organic fertilizer using by farmers ?

Lunna [17]

Typical organic fertilizers include mineral sources, all animal waste including meat processing, manure, slurry, and guano, plant based fertilizers, such as compost, and biosolids.

Hope this helped :)

5 0

2 years ago

Read 2 more answers

If a 45.6 g piece of aluminum has a density of 2.1 g/mL, what volume would it have?

Mashcka [7]

Answer:

$\boxed {\tt 21.7142857 \ mL}$

Explanation:

The density formula is:

$d=\frac{m}{v}$

Rearrange this formula for v, volume. Multiply by v, then divide by d.

$d*v=\frac{m}{v}$

$d*v=m$

$\frac{d*v}{d} =\frac{m}{d}$

$v=\frac{m}{d}$

Volume can be found by dividing the mass by the density. The mass of the aluminum is 45.6 grams and the density is 2.1 grams per milliliter.

$v=\frac{45.6 \ g }{ 2.1 \ g/mL}$

Divide. Note the grams, or g, will cancel out.

$v=\frac{45.6 }{2.1 \ g}$

$v= 21.7142857 \ mL$

The volume of the aluminum is 21.7142857 milliliters.

3 0

3 years ago

Which is a characteristic of glacial movement?

xeze [42]

Answer:

(B) Movement depends on the balance between accumulation and wastage.

Explanation:

A Glacier is accumulation of snow over a particular region over many years. It is balanced by zone of accumulation and zone of wastage. The zone of accumulation is the top of the glacier where the snow or ice accumulates whereas the zone of wastage is the bottom region of the glacier which melts slowly over time. A glacier sustains if the zone of accumulation is greater than the zone of wastage.

3 0

2 years ago

Read 2 more answers

Which of the following equations is balanced correctly and has the correct products for the reactants RbNO3 and BeF2?3RbNO3 + 3B

zvonat [6]

Answer:

2RbNO₃ + BeF₂ → Be(NO₃)₂ + 2RbF, because Be keeps a 2+ charge throughout the reaction.

Explanation:

It is a double replacement reaction.

A double replacement reaction is a type of chemical reaction where two compounds react, and the positive ions (cation) and the negative ions (anion) of the two reactants switch places, forming two new compounds or products.

In this reaction, there is no change in the oxidation state of different atoms.

It is just a replacement reaction.

So, the right choice is:

<em>2RbNO₃ + BeF₂ → Be(NO₃)₂ + 2RbF, because Be keeps a 2+ charge throughout the reaction.</em>

5 0

3 years ago

After the equation below has been balanced for a reaction in an acidic solution, what will the coefficients of the reactants and

Sophie [7]

First, we have to start balancing the equation:

H2O2 + FeSO4 + H2SO4 → Fe2(SO4)3 + H2O

we can see that the number of H atoms on the left side is 4 and on the right side is 2 so we have to make the number of H atoms are equal on both sides

so, we will put 2H2O instead of H2O

H2O2 + FeSO4 + H2SO4 → Fe2(SO4)3 + 2H2O

we can see that number of O on the left side is 10 and on the right side 14

so we will put 2 FeSO4 instead of FeSO4

H2O2 + 2FeSO4 + H2SO4 → →Fe2(SO4)3 + 2H2O

∴ the coefficients of the reactants and products will be in order 1 2 1 1 2

3 0

3 years ago